Abstract: The invention concerns a method of synthesizing a replica used in the compression filter of pulse compression radar.The replica is calculated from the spectrum of a required impulse response.The required impulse response is preferably obtained from an analytical function, such as a sinc function or a weighted sinc function, and a template.It is preferable to use calibration signals of the instrument to calculate the replica.The invention also applies to synthetic aperture radar.

Abstract: A method of defocusing range ambiguities in a pulse radar, in particular of the SAR type, the method comprising the following steps:radar pulses are spread on transmission by using a plurality of "chirp" rules for varying the frequency of the transmitted wave as a function of time;during transmission of successive pulses, chirp rules are alternated between chirps that rise and chirps that fall in the frequency/time plane of the pulse;received echoes are compressed by matched filtering using a correlation operation between the received echo signal and the chirp rule that was applied at the time of transmission of the pulse that gave rise to said echo signal;said method being characterized in that said plurality of rules for varying the frequency of the transmitted wave as a function of time comprise a number M of said rules, with M being an integer greater than or equal to 3.